TIA Portal V18

CPU S7-1200, CPU 1214C

I have an issue using TMAIL_C V6.1 where every attempt to send an email results in a status of 8535 - SMTP authentication incomplete.

I've imported the certificate and verified the username and password are correct. I've read that Gmail has introduced OAuth 2.0 and as of March 2025, disabled the ability to use less secure apps. Is v6.1 of the instruction compatible with OAuth 2.0? Gmail isn't a necessity. It was chosen to just quickly test.

I've been using this document and this site as my main references.

Attached are my settings. Does it look like anything is incorrect?

Thanks in advance.

Best Regards